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$326+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/23. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Jul 6 — Jul 131
Mon 7/6
Mon 7/13
1 adult, Economy
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Cheap flight deals from Decatur to San Diego

Cheapest flights from Decatur to San Diego
Explore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 6, 2026.

This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/199:37 am
DEC
-
SAN
2 stops15h 12m
United Airlines
Tue 6/238:32 pm
SAN
-
DEC
2 stops10h 25m
United Airlines
Deal found 6/4$429
This United Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:37 am
DEC
-
SAN
1 stop7h 48m
United Airlines
Tue 7/216:40 am
SAN
-
DEC
1 stop9h 16m
United Airlines
Deal found 6/3$445
This United Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:37 am
DEC
-
SAN
1 stop7h 48m
United Airlines
Mon 7/206:40 am
SAN
-
DEC
1 stop9h 16m
United Airlines
Deal found 6/3$477
This United Airlines deal was found by Cheapflights users on 6/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:55 pm
DEC
-
SAN
1 stop18h 16m
United Airlines
Wed 11/410:30 pm
SAN
-
DEC
1 stop8h 16m
United Airlines
Deal found 6/2$499
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/29:37 am
DEC
-
SAN
1 stop7h 48m
United Airlines
Thu 7/910:25 pm
SAN
-
DEC
1 stop8h 32m
United Airlines
Deal found 6/4$506

Find flight deals from Decatur to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$429
(United Airlines)

One-way from

$326
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-San Diego flight deals.
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Provider most trusted by Cheapflights users for Decatur Arpt-San Diego flights.
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From Decatur Arpt to San Diego
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One-way flight from Decatur Arpt to San Diego
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Decatur to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 6, 2026.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Fri 7/17

9:37 am-3:25 pm

1 stop7h 48m

San Diego

Tue 7/21

6:40 am-5:56 pm

1 stop9h 16m

$445

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Sat 10/31

6:55 pm-11:11 am

1 stop18h 16m

San Diego

Wed 11/4

10:30 pm-8:46 am

1 stop8h 16m

$499
Quickest round-trip

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Thu 7/2

9:37 am-3:25 pm

1 stop7h 48m

San Diego

Thu 7/9

10:25 pm-8:57 am

1 stop8h 32m

$506

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Thu 7/2

6:45 pm-9:29 am

1 stop16h 44m

San Diego

Mon 7/6

6:40 am-5:56 pm

1 stop9h 16m

$524

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Thu 7/2

6:45 pm-11:21 am

1 stop18h 36m

San Diego

Sun 7/5

10:25 pm-8:57 am

1 stop8h 32m

$534

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Fri 7/17

9:37 am-7:51 pm

2 stops12h 14m

San Diego

Mon 7/20

6:20 am-5:56 pm

2 stops9h 36m

$566
Cheapest one-way
Quickest one-way

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Tue 6/23

6:45 pm-9:28 am

1 stop16h 43m

$326

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Thu 7/2

9:37 am-9:29 am

1 stop25h 52m

$331

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/2

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Decatur, Illinois-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Decatur to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Decatur with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated June 6, 2026.
Read reviews from past customers who have flown United Airlines from Decatur to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,777 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.
United Airlines
7.4
Good
9,777 reviews
United Airlines
7.4
Good
9,777 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.

Related info for your journey

Find useful and relevant information for your journey from Decatur to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Decatur, Illinois to San Diego?

    Departing from Decatur, Illinois to San Diego will take you 15h 12m. The distance between Decatur, Illinois and San Diego is about 1643 mi.

  • Can I find deals for flights from Decatur to San Diego that include hotel bookings?

    Yes. In addition to deals on Decatur to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Decatur to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Decatur to San Diego.

  • Can I find deals for business class flights from Decatur to San Diego?

    Yes. Cheapflights offers flight deals from Decatur to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
National City
Poway
Coronado
La Mesa
Santee
Julian
Lemon Grove

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Top airline flying from Decatur to San Diego

Discover the top airline that operate flights from Decatur to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$284Average$435FlexibilityNo cancel feeOn-time69%

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